Eraser-cleaning machine.



6-. U. THOMPSON.

. ERASER CLEANING MACHINE.

APPL|CATION FILED DEC-24. l9l4.

Patented Dec. 7, 1915.

In 11 71 0 7, @4444 aim,

COLUMBIA PLANOGRAPH C0,, \VASHINUTDN, D. C.

, PATENT OFFICE.

em'r U. THOMPSON, or onnan. FALLS, IOWA.

nnasnn-onnamivo MACHINE.

To all whom it may concern:

Be it known that 1, GRANT U. Tnoarrsorz,

and-a resident of Cedar Falls, Blackhawk County, Iowa,

specification. My invention relates to improvements in my improvement is to furnish in such a machine anintersticed drum rotatably mounted in a casing, said casing being in commu nication with an adjoining chamber having means therein for exhausting the air from said casing.

Another object is to rovide said auxiliary chamber with means or fumigating its interior and the contents of the drum in said casing.

These objects I have accomplished by the means which are hereinafter described and claimed, and which isillustrat'ed in the ac- 4 companying drawings, in which:

Figure 1 is a vertical axial section of the chine, with the intersticed drum in side eleration," and with other parts broken away.

"-Fig- 2 is a. transversesection of my saidmachine; Fig. 3 is an end elevation of said compartment. Fig. isan enlarge plan 5 view of one of the cam fasteners of the hinged door of said intersticed drum.

Similar numerals of reference denote corviews. g

The casing land lts closure 2 are semi- 7 cylindrical in form and hinged together at 3.

A cylindrical drum'6 is contained within said casing and closure, and is made of net- 4 ted wiremounted upon a shaft 4 rotatable in bearings 11 fixed in opposite heads of said casing, and supported on the downwardly diverging legs 5; The drum 6 hasan openin inits circumferential wall and a door 8 w is tted'thereinand hinged thereto by hinges 9 in the format rings, passed about the air of transverse rods framing said door an the adjacent part of said. opening. The-like pair g ofsaidndoon and theabuttmg e go oi the specific ation of Letters Patent.

a citizen of the United States of America,-

have-invented certain new' and useful Improvements n Eraser-Cleanmg Machines, of which the followings a:

eraser-cleaning machines, and the objectofcasing and dust-collector of my said ma machine, with parts broken away. Fig. 4, is a central,'vert1cal, longitudinal section ofthe auxiliary chamber and its fumi atingresponding parts throughout the several of rods which frame the 0p osite side'- Patented Dec. '7, 1915.

Application filed December 24, 1914.' Serial No. 878,952.

air of These are of a well own type composed of alined plates 10 and 13. The plate lOlias a hooked-shaped projection 14, and the plate 43 has a pivoted cam which may be swung under said hook to engage same and hold the plates together detachably. By this means, the transverse bars Q7 and 18 of the drum and its door, respectively, may be detachably secured together.

The semi-cylindrical cover 2 has a longitudinally arranged, relatively narrow slot 19 which serves as an air inlet port, and is located in its upper part. The lower casing part 1 has a slotted air outlet port 7 running the entire length of its lowest part, and a relatively long and rectangular conduit is in communication with this port.

The numeral 12 denotes an'auxiliary cham' berarranged adjacent to the lower part of the casing 1 longitudinally, and has along its side adjacent to said casing, the longitudinal slotted opening or inlet port in communication with said conduit and the interior of the casingby way of said ort 7. This chamber is approximately of t e same length as said casing, and is made preferably of the form ofza hollow frustum whose -ends are covered by detachable closures. The larger end of the'frustum' has its'closure 13 of cupshap'ed form to extend into its hollow, and said part 13 is slotted along one side to cfi'ect communication with said port'7. Said closure has also a'd'ependin part 16 which is in communication with tie conduit 21, the latter leadin into an orificed' head 1 of a hollow cylindrical dust collector 32 located immediately under the said'casing 1. The other 'and'smaller end of the frustum 12 ha'sa-closure 18 which is likewise longitudinally slotted 'to register with said port 7, and which is formed with an outwardly extending and also depending pocket or compartment 19 which is in communication with the interior of the frustum. In the upper part of the compartment 19 is an opening provided with a detachable closure 20.

Ina bearing 17 on the first mentioned closure 13 is seated a rotary shaft 14, carryin on its outer end the pulley 17 and on its drum are detachably connected by a cam fasteners.

; at or end within the closure, a fan wheel The numeral 26 denotes a motor seated upon a bracket 27 fixed on one of the legs 5. The power shaft 25 of said motor has a worm thereon in mesh with a worm wheel fixed on one outer end of the drum shaft a. A pulley 29 is also mounted on the shaft 25, the extremity of said shaft being seated in the bearing 28 bracketed on another leg 5. A belt 31 is passed about the pulleys 29 and 17 after traversing the intermediate idler pulley 30. By said means, the drum is given a relatively slow rotation, while the fan wheel 15 is more rapidly rotated to exhaust the air from the casing 1, and the frustum 12 and drive it through the conduit 21 with its contained floating chalk dust into said dust collector 32. The dust collector is of cylindrical form, and has a hollow head 33, through which the conduit 21 passes to communicate with the chamber in said head formed by means of a partition 36. IVithin said cylinder is a dust collecting chamber of hollow cylindrical form and removable therefrom. This chamber has opposite heads 35 and 40, the head 10 being imperforate while the other head 35 as well as the partition 36 which are in contact, have registering openings in which is seated a short tube 3 1 which effects communication between the two said dust collector chambers. Said dust collecting chamber has it heads 35 and 40 connected by means of a plurality of longitudinal bars 37 covered by inner and outer tubular casings of filtering material 38 and 39. Within the other end of said cylinder is seated a sleeve 41 spaced from the head 40 but permitting the passage of exhausted air therebetween.

Operation: When a quantity of erasers, filled with chalk dust, are placed in the netted drum 6 and its door 8 closed and secured, said drum is placed in rotation. l/Vhen said drum has been rotated a sufficient length of time, the erasers may be removed through said door after the cover 2 has been lifted. Since the fan wheel 15 has been simultaneously actuated, it has exhausted the dust laden air from the casing 1 by way of the port 7 and the frustum 1.2 and driven it through the conduit 21 into the dust collecting device 32 where most of the dust is deposited in the first chamber 33. The air which passes through the tube 3a has the remainder of the dust removed therefrom by the filtering layers 38 and 39.

hen considered necessary or desirable, the uncleansed erasers in the drums 6 may be fumigated before the drum is placed in rotation, by the following means: A suitable fumigating material, such as formaldehyde, may be placed in the compartment 19 of the closure 18 of the frustum 12, the fumes of said disinfectant will quickly disseminate themselves through the casing 1 by Way of the port 7.

The casing 1 and its closure 2 greatly minimize noise in the operation of the drum 6, while the provision of an auxiliary chamber 12 permits all of the chalk dust to be quickly removed from said casing.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is:

1. In an eraser cleaning machine, an open casing, an orificed closure therefor, a woven wire drum rotatably mounted in said casing, said drum having an opening and a closure therefor, said casing having an exhaustport, an auxiliary chamber in communication with said exhaust-port, said chamber having removable closures one provided with a port in communication with air-exhaust ing means and a dustcollector, and a fumigation chamber in the other removable closure in communication with said auxiliary chamber.

2. In an eraser cleaning machine, an open casing having a closure provided with an air-inlet, said casing having at its bottom an outlet port, an auxiliary chamber adjacent to said casing, means of communication between said outlet-port and the auxiliary chamber, a rotatable drum in said casing having an opening and a closure therefor, said auxiliary chamber having its opposite ends open and provided with removable closures, one of which has an exit-port, and the other of which has a compartment opening into the interior of the chamber, and airexhausting means in said auxiliary chamber.

3. In an eraser cleaning machine, a hollow casing divided into parts hinged together and provided with both inletand outletports, a rotatable woven wire drum in said casing, means for rotating said drum, said drum having a door-opening and a closure therefor, and a chamber with removable ieads in communication with the said outletport of said casing, one of the heads having an exhaust-port, and air-exhausting means in said auxiliary chamber.

4;. In an eraser cleaning machine, a hollow casing divided into separable sections, a woven wire drum in said casing, means for rotating said drum, said drum having an opening and a closure therefor, said casing having in its upper part an air-inlet and in its bottom part an air outlet in the form of a relatively narrow longitudinal slot extending approximately its entire length, an auxiliary chamber arranged alongside the lower part of said casing and slotted longitudinally approximately its entire length, and a flattened conduit connecting said casing and chamber to effect communication between said narrow slots, said chamber having removable end closures, one of which has an air-outlet, and air-exhausting means in said chamber.

5. In an eraser cleaning i e, a i gs arranged side by side, of differing dimensions, the larger being divided to form a basal part and a movable closure therefor, the smaller having detachable closures on its opposite ends, the smaller casing being in the form of a frustum, air-exhausting means in the larger end of said smaller chamber, said larger end having an air-exit port, and a drum rotatably mounted in the larger drum, the larger casing having an air-inlet and an air-outlet with said air-outlet in communication with the smaller casing through the whole length of both.

6. In an eraser cleaning machine, three chambers located near each other, the first being large and having an opening provided with a removable closure, also having an airinlet and an air-outlet, the second chamber having an opening in communication with the air-outlet of the first chamber, and having a detachable head provided with an outlet-port, the third chamber having an air outlet and an air inlet, in communication with the air-outlet of the second chamber, a rotary intersticed drum being mounted in the first chamber, air exhausting means in the detachable head of the second chamber, and a dust collector in the third chamber.

7. In an eraser-cleaning machine, three serially communicating chambers, of which the first has an opening with an orificed closure therefor, a rotatable drum mounted therein, having an opening and a closure therefor, the intermediate chamber being a hollow frustum with removable end closures, the closure in the smaller end having a compartment opening inwardly into the chamber and having an opening with a removable cover, the closure in the larger end of said chamber having a bearing for a fan-wheel shaft, and the communication between the said first and second chambers extending the entire length of each, the third chamber be ing open at its end opposite its communica tion with the intermediate chamber and adapted to contain dust filtering means.

Signed at Waterloo, Iowa, this 8th day of Dec., 1914.

GRANT U. THOMPSON. Winesses W. H. BRUNN, Gno. G. KENNEDY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

